The prices are all over the map. The last one I saw on eBay went for over $160 with shipping. I also saw one recently well over $200 selling after much action. It's a scarce item, and an eager buyer will overpay to get one, from all indications. If you can find one at a dealer (slight chance), it might actually be cheaper than auction.
I bought mine years ago, and still paid a substantial price. If you need it, it's worth it. The alternative is to seek out a good 7s, which you will enjoy, if in nice shape. That might be a better option, if you can also get a decent price for the 7 you own.
Harry