Where can I buy replacement spokes for an SRAM S30 sprint rear wheel?

Best solution to a wheel that's wobbling all over the place because it's missing spokes: Replace the wheel. Why? Straightening a wheel that's messed up because it's missing a few spokes is a difficult art.
Next best solution: Bring the wheel to a bike shop and ask them to replace the missing spokes and true the wheel. Why? See above.
If you insist on having a whack at it, you can remove the wheel by loosening the axle nuts and slipping the wheel out of the frame. You may need to remove a brake pad to get the tire past the brake assembly. Then take the wheel to your friendly neighborhood bike shop and ask them to remove the freewheel assembly from the hub (it requires a special tool that you don't have). Buy some spokes and nipples while you're at the shop. Be very nice to the bike shop people because they'll likely be the folks you'll come back to when you decide you need a new wheel. Once you have the spokes in and the wheel is straight (good luck with that), you can replace the gear cluster without the tool the shop used to take it off, since the freewheel doesn't freewheel in the direction you turn it to put it back on. Good luck!

It's hard to believe a shop can't deal with what sounds like loosening spokes. OTOH, we Clydesdales are tougher on wheels than the lil guys. I used to break a lot of spokes under high torque demands, especially on several sets of Spinergy Spox wheels, then I bought a Park spoke tension gauge and meticulously trued and tensioned all the wheels on all my bikes. Haven't had a spoke issue since then.

Or you could get an old set of Spinergy Rev-X like I did a long time ago before I figured out the tension thing. If you can break or bend them you are not human.

the rear spokes are the same size( yes ).

Simply buy a replacement spoke. Unscrew the dustcap on the tyre valve and deflate the tyres inner tube. Remove tyre using tyre levers(as you do to repair a puncture). Next remove the inner tube to reveal the spoke tensioners. undo the tension nut and allow the broken spoke to fall out, feed the other part of the broken spoke out of the hub. feed the replacement spoke through the hub and into the hole on the wheel rim. Now screw on the tensioning nut to the spoke.Tighten up to the same tension as the other spokes. replace inner tube and tyre, then reinflate. Viola!

Yeah, derailleurs are sold as a complete unit, just replace it.

If you are running a SRAM or Shimano Cassette, then the spacing will be ever so slightly off. If you want to have precise clean shifting then you need to either replace the cassette body with a Campy one and replace the cassette with campy or get a 10-speed conversion cassette such as those from American Classic. Campy spacing on a shimano/ Sram spline.

The wheels in and of themselves should not make any difference.

Another trick for perfect shifting, make sure that your rear derailleur and shifter match - Campy to campy, Sram to Sram as examples.

buy a spoke wrench and a spoke for your model bike
remove the tire, tube, and the rubber protection band on the inner wheel
feed the new spoke through the spoke's mounting hole on the hub first
now feed the spoke through the hole in the wheel. you may have to tweak the spoke somewhat to get it in place.
if the spoke is the correct one place the spokes nut to it and thread it on by hand first then use the wrench. tighten it up snug and snig the rest of your spokes with the same tesion a little at a time

hi i have a samsung instinct s30 and trying to install pictures from computer to my phone. I spoke with someone from sprint and I was told I needed the card reader/writer which I purchased and no suceess

Valco only sells replacement parts for a few years. I recommend that you look in thrift stores for a valco you can use for parts

Tighten the two pinion gear bolts that are holding the rear wheel, if the wheel is wobbling, then that is the problem.

If this does not fix the problem, you will probably better buy a new wheel, or replace the whole pinion gear and axis assembly, better to replace the wheel.