Since the real experts already chimed in, I'll add my opinion. You will not find many nice '13-'14 Zeenuts for less then $50 right now... Maybe none at all.
I've only been collecting LA Zeenuts for around a year and a half. I have a total of one '14 LA player and I happily paid $60 for it. It's a nice card and I thought it was a great deal.
Grading Zeenuts is important, if you are buying a card sight unseen you want to know if it's poor, good, Vg etc. The card not having the cupon attached is pretty much a given. With that being said, imo slabing Zeenuts is the biggest waste of money in the hobby, similar to flushing money down the toilet
If it were my deal, and he has more of the set not yet sent to PSA, I'd ask if we could work out a better price and just hold the PSA fees. Save each other money.