Let us know the prices people are offering you via private message, wouldn’t want to see you getting ripped off!
I've directed him towards eBay sales...
3 Celnets £40-55 each, some a little more but that's a decent ball park.
Dialaphone 03/04 and the BT Celnet 99/00 have both sold recently for £40-55 too.
Celnet 98/99 away shirt sold for a little bit more at £60.
ICI away has gone for £125 recently - but the listing is in very good condition.
The one that I want, the Heritage Hampers has sold for both £50 (https://www.ebay.co.uk/itm/Middlesbrough-Home-Shirt-Boro-1988-1989-1990-Small-/265686352289) and £250 (https://www.ebay.co.uk/itm/Middlesb...-Heritage-Hampers-Skill-Leisure-/304458956683) and I can't work out the difference there haha. I wish I saw the £50 listing, but I assume the real price is somewhere in the middle.