Older thread on the same subject: Who makes a good SK68?
The only one I’m told can be relied on to have a solid pill is the one RMM is selling:
http://www.mtnelectronics.com/index.php?route=product/search&search=OK
There are so many junk SK68 variation copies out there — I’ve been through half a dozen — that it’s a good reminder that “budget” doesn’t mean “cheap” — it means good value.