The ones I did this year were a miniature white cucumber from Johnny's, and they were and still are, on sale!
http://www.johnnyseeds.com/p-7...
I had a different variety before but I can't remember which one. I think I got the seeds as a gift. I like to try different things for market and people weren't buying them because they were different until we gave tastes. Then they were SOLD!!! So mild and never bitter. Don't even have to peel them. If they get big they do turn a pale yellow but still never bitter.