I sent the board from my Frigidaire range to Canada earlier this year and it was around $100. Ther's also a place that lists rebuilding services on eBay
Try FixYourBoard.com. They have a 2-year warranty on the work, list of boards by part number on the site but can do others. Price varies per the board. I had my parents' wall oven board repaired several months ago, $130 +sales tax, including return shipping (customer pays to send it in). Sent it on Tue, back on Fri.