What's Single Sided Write Once Media? On newegg.com there's one that's:
Ritek DVD-R 4.7G 4X 50PACK, Model DRD-47-4X-RDSM, OEM
and one thats:
Ritek DVD-R 4.7G 4X Single Sided Write Once Media 50pk, Model DRD-47-4X-RD-IW, OEM

Which should I get? Or does it even matter?

Also, is Arita the same exact media as Ritek? Same non-silver top as well with protection on top of dvdr? I haven't found a good deal for Ritek or Arita yet that's DVD-R 4x that's under $1.00 each with shipping included....

Arita seem to use the Ritek dye but I can't confirm that for sure. Also I don't know what the deal is with newegg but they have the exact same discs listed with different numbers and one costs $1-$2 more than the others. Both of them are single sided and write once (there are dual-sided discs which can be written on both sides, write once simply means that you cannot re-write the disc). So go for the cheapest pack and you will be fine.

Try http://www.meritline.com/rit4xcerhigd.html
Ritek G04 for $1.00 in 100 pack, less if you order more, and with free shipping. I have ordered hundreds of discs from them. Very reliable company.