Just a quick scan on eBay is already showing price increases for the 668.
From my recent observations on eBay, I found the following prices for the PRO-668:
1. $290 Buy It Now for "New" on 12-22-2016 (Radio Shack Pro 668 Scanner | eBay)
2. $260 with 3 bids for "New other" on 12-22-2016 (RadioShack Pro-668 SCAN IT Handheld iScan Digital Scanner Multi-system digital | eBay)
3. $316.77 with 23 bids for "Used" on 12-27-2016 (Radio Shack Pro 668 Scanner)