Petco shouldn't even sell Silver Arowana. IMO It's extremely irresponsible on their behalf. And 65$ does seem overpriced. I've seen plenty Silver Aro under 65$ from online vendors and aquabid, and that's under 65$ including the s/h.
Wow! You guys are finding some really good prices, the LFS by me has 3" for 60 bucks. They have only carried them a few times in the last couple years.
4-5" wild arowana is about $12. i bought mine at pomona few weeks ago. actually, he had few hundreds more left! search on craigs you will find him. goodluck!