Type II isn't getting any cheaper...or easier to find. Sometimes you can get lucky and find them cheap at a thrift, but I've yet to find any at a thrift near me at all. The average going rate per tape on the Bay seems to be around $3.50-5/tape. It can go higher for single tapes (always go for a bundle versus single tape listings), or for 80's era NOS (The TDK SA90s w/the black and green label seem to fetch $8-10/tape).
I did read something recently about RTM's new FOX brand cassettes (which are a quality new Type I), about possibly trying to do a new Type II at some point, if they can find a good source for new manufacturing. It's my understanding that no one is making it at the moment, but some of the production equipment still exists, and it can still be made in many countries outside of the US - there just isn't enough of a market for it for the time being.
So, extremely slim chances, but there might be some hope for a new Type II at some point if this mini-cassette resurgence thing going on continues. If you want to play it safe though, I'd just stock up on a bunch of NOS Type IIs