Hey my LFS sells RBP ranging from $15-$25 when smaller, but when they have larger specimens they sell for $50 a piece. So 5 of them would be $250 dollars worth but if you wanted to sell them then I would say aim around $150 or so.
...I am talking canadian currency though
Depending on where or who you get your RBs from, I say $250 is a decent price. Usually P's sold in LFS in cali (Yes, I said Cali), would boost up the prices even for babies. Best places to get them are from folks you know. Some would sell dime sizes from $5-$15.. others would sell larger, 6-8" for $20-$30 because like most hobbyists, most get tired of what they have and would like to start off fresh again.