I go for the cheapest available. Here's an example:
http://www.ebay.com/itm/5-x-Pair-of...575075?hash=item1eb7514363:g:RTwAAOSwHnFVpMdv
This example costs 60 cents apiece. That makes them disposable. I throw one away about once a month.
http://www.ebay.com/itm/5-x-Pair-of...575075?hash=item1eb7514363:g:RTwAAOSwHnFVpMdv
This example costs 60 cents apiece. That makes them disposable. I throw one away about once a month.