If you go for +R, I think the choice is quite narrow. The number of brands are actually less than -R and most of them are… either I don’t believe them or just too expensive. Hmm… Ritek branded RICOHJPN01 may barely fit in your standard. (As long as you’re sure of the media code.)
I’ve been recently thinking of prodisc +4x or +8x for the next purchase (one or two months later). Even the 8x one are cheap enough for your 50~70c standard. But their +R is not as famous as their -R discs so… I don’t have enough clues to judge. (Some people even claimed that +4x prodisc is better than the +8x one. Really?)
The above Samsung-TY one in a little bit off your budget, but regarding TY brand name… maybe worth considering.