Looks like someone's clearing out their collection - lots just cropped up on Ebay. https://www.ebay.co.uk/b/Brighton-Hove-Albion-Memorabilia-Football-Shirts/106485/bn_18337260
Which shirts are you missing?
As an aside - just flicking through your website - astounded that we produced those red and blue tops at one point! Even if they were 'special'.