Teresa - After 6 kids, I'm sure you know this already but I figured I'd say it just in case you didn't. The internet is the WAY TO GO when ordering OPK's & HPT's for us POAS addicts. They are slightly more sensitive than ones available in the stores so you can get your BFP sooner and they are oh so much cheaper.
I got some that are 10 mIU @ webwomb.com. 5 tests for $13. I also ordered a ttc kit @ early-pregnancy-tests.com. It was about $35 and it included 50 (yes, FIFTY) OPK's and 15 (fifteen) HPT's. They are slightly less sensitive at 20 mIU. (I also got my pre-seed there...) CBE non-digi's are 25 mIU. Everything came within a couple days of ordering and was very discreet in the mailbox. I've also heard e-bay is great for hpt's but i've never tried that.
It's hard to justify poas so often when you're paying $13 for 2 tests but I feel way less guilty about poas 8 - 10 days per cycle when they're so cheap.