I think it was around 180 quid when I got it in 2014. The square pictures were a bit cheaper.
Although a quick Google suggests prices have gone up a bit since then!
https://www.buy-art-online.co.uk/shop/Alberto-Martinez-c20805065
My favourite picture hanging up in my living room:
He's a Cuban painter living in Brighton. Got some fantastic abstract paintings.
http://www.albertomartinez.co.uk/