What can I buy with Kč172.90

You can buy one of the following:

Prom ticket
Ticket to a BBC Proms classical music concert, standing for £5 (Kč150.70) from source
Cupcake Trinket Box
Gifts for £5 (Kč150.70) from hawkin
Cat Walk Model
Arts and craft for £5 (Kč150.70) from hawkin
Wind Up Monkey
Retro toys for £5 (Kč150.70) from hawkin
Impossipuzzle Camper Van
Retro toys for £5 (Kč150.70) from hawkin