Hey!
I recently got my hands on about 30 sealed unweighed Base set UK print booster packs. I might sell the extra ones I don’t need for my sealed collection but I’m not sure about pricing for those? Or is it better (from a financial standpoint) to open them and grade the 1999-2000 stamp holos and rares?
Appreciate any help! Thanks! 
If you decide to open them keep in mind 1999-2000 packs contain 1999 holos as well, in long run it’s better to sell sealed packs because they’re pretty rare.
I usually buy my base set English 99/00 packs for the same price as regular base set.
Advertised as 99-00 packs or advertised as regular packs? If the pack is confirmed 99-00 it will bring a much higher price than a regular unlimited pack.
Just listed as regular packs yeah, dunno if being from the UK has to do with it. One seller recently sold me all their packs (20+) but they were a video game eBay store.
dame open the packs and sell me the 1999-2000 holos need me a mewtwo hah