Academy has a larger selection than Dicks. Mainly they carry Innova DX, a couple or three champions(valkyrie, monarch, beast), 2 stars(xcaliber, aviar), some millennium, epic(don't know the name of the manufacturer). They even carry a few lighted discs as well as add on lights and bags.
DX plastics are $7, Champion $12, Star $14, if memory serves.
Planet K also carry discs though they seemed priced a few dollars more than Academy.
Finally the convenience store on Judson nearest to Live Oak disc golf course also carries discs, including discraft.
Besides that, there are no play it again sports in S.A., unfortunately.