The current Accuquilt Go! starter kit sells for $250 on the website:
http://www.accuquilt.com/shop/fabric...ic-cutter.html
Prices on the Go! have come down in recent years, especially since the company came out with the Go! Big electric version.
I agree to check out eBay sold listings for the sewing machine. To do this, you need to sign into your eBay account (easy to create one if you don't already have an account). Search on the item you are looking for, then look along the lefthand side of the screen so you can check the option "completed listings" under the "Show Only" category. This will bring up all the listings for the last 30 days or so (maybe longer; not sure). Be aware that only the prices in GREEN have actually sold. Prices in black were asking price of items that did not sell.
Are you a member of a local quilt guild? That can be a good place to advertise items like these for local sale. My old quilt guild had a table at the entrance where members could place flyers for items they wanted to sell.
Edit: Are you absolutely sure you want to get rid of the Go!? I didn't like mine at first, in part because it was hard to crank, but also because I just wasn't used to it. However, the first time I used it to cut triangles, I realized how useful it is. I sewed the best triangles in my sewing career simply because they were all cut accurately with all the dog ears off; made lining them up very easy. I have since found that I love the applique dies for machine applique freezer templates; cuts the freezer paper very quickly and accurately. Even though I didn't love the machine at first, I have come to really enjoy it.
Edit 2: Just want to mention I'm not sure that the current "starter kit" on the Accuquilt site comes with the same die or set of dies that your set came with. Be sure to compare to see if the dies are the same ones.