Don't buy from e-Bay regardless of price. Too much air-soft knock-offs there and you will get taken.
SWFA has them for $50. Not as good as the above but not bad either. Watch their sample list because I got my last one off that section for $35 but they are far and few between.
Check www.arizonagunrunners.com - I think that's where I bought mine, about $10 off GG&G's list price. Meprolight sights are also available thru them at a reasonable cost. They ship fast and in my dealings have been a good company worthy of repeat business thusfar.
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