Very interesting question...
Brush: Kent Infinity Silvertex available for £10 in the nearest John Lewis store
Soap: MWF/Kent Luxury soap less than £6 at John Lewis (I do not work for them)
Cream: Erasmic cream £1.50 at Savers, Groom shave cream when available in special offer at Lidl for £1.30
Razor: Egyptian Lord L6 (with its Merkur HD/34C head) around $10 from Ebay, Chinese Rimei razor at €4 from DX
AS: Forest fresh AS lotion by Superdrug £2-3, very versatile office safe AS lotion with a greenish citrus scent
On the other hand, from my own experience, I would consider a Progress at £40-50 to be a good value for the money on the long term.