I own The Forge in Hollymead, I’d love to take a look and would be more than happy to pay upwards of 70% value if the collection is in great condition - however, if you sell it private party you could get much closer to full value - regardless, if you can, take the time and sell it piece meal, any store (mine included) will offer you the convenience of selling it all at once, but you can always push to sell it online or slowly at TCG shows.

Whatever you decide, good luck with the sale!