I seem to remember another thread not too long ago where someone asked about Apple II educational software for sale.
Right now, sir_ghoul, who is an exceptional seller on eBay, has numerous titles for auction from MECC and other educational software publishers. All of his auctions start at only 99 cents and his shipping is reasonable.
For those of you in the market, he may have just the software you have been looking for.
On occasion, he also sets out some really good utilities, and other programs. I have been a satisfied customer for over a year.
Good Hunting. 
As stated before "sir_ghoul" has many more MECC Educational titles for sale on eBay.
He usually starts his auctions at 99 cents.
Good luck.
I was just notified that "Sir_Ghoul" (aka John) is closing down his sales at the end of August. He is moving and and apparently has no way of shipping from his new location.
He has had many Apple II programs; mostly Utilities and Educational software, for sale over the last year starting at only $0.99 per auction. Everything that I have purchaced from him has been in really good to excellent condition.
It is my personal opinion that he has been a good seller on eBay, and a good friend to the Apple II community.
I will be sorry to see him go. If you get the opportunity, and are looking for some Apple II software by all means see what he has left for auction. You might be surprized.