No one would give an accurate price for them at present you could check previous ttcld sales and make a comparison as there are no sales static’s and the extension is only days old If your just looking to sell then £50 … it could be under priced ,the market value, overpriced just too early to tell….?
Companies/Business will be waiting and see if it takes analysing the market, see how well they do, public acceptance , search engine perceptions etc (if any were guaranteed worth thousands at the start someone would have pre regged iffy trademark or alike in most cases )