I believe 30 copies each of 1001 Spikes and VVVVVV. To date, 6 copies of Isaac have been seen. Here is the best Vita checklist. It's missing 1001 Spikes, VVVVVV, The Binding of Isaac, Revenge of the Bird King, ESRB Invizimals and Epic Mickey though.
https://psoarchive.neocities.org/collect/the_vita_r1_checklist.pdf