Get a guy who buys pancake to spool you off some being 2 7-inch spools = 1 standard 10/5-inch pancake
and 4 7-inch spools = 1 duplication pancake (14-inch). What deck are you recording it on?
Don't know if the shipping will be too expensive but this German site could be worth a try. Thomann Cyberstore
They've got RMGI 1/4" tape for a reasonable price and are willing to sell one tape at a time.