Anyone know how to get the black glue marks off?

Before throwing away the patch, reverse it and with the sticky side, rub it gently over the black glue marks. (They are usually only on the edges.) The marks come right off.

How many you get for this price? the ad says "8 count (pack of 3)". does that mean you get three packages with 8 patches each (32)?

Yes, 3 packages of 8, so 24 all together. That's a 3-month supply since you use 2/week.

What are the expiration dates of these 2 patch sets?

I don't know that there is an expiration date. I always use mine before there would be a date. Each box lasts 4-6 weeks, 3 boxes and they always work to the last one. So I wouldn't worry about an expiration date.

What is the experation date on these?

Each patch last 4 days, but there is no expiration date on the box, which there should be. If the patch is still effective is stamped on the patch itself. I am going to contact Oxytrol about the important expiration date.