Depends what model you are looking for. I have a seller that I went through for my TA31F a while back. I got it for 890. Actually cheaper than Botac.. PM me and let me know what model you are looking at.
I got my ACOG from SFWA because they're VERY dependable. They do price match, so I shopped around and found a sight that was selling for about $100 cheaper from a less reputable sight and they matched the price. Read SWFA's sight on price matching and it's very easy to submit.