While not the most popular game around, these designs are pretty cool. Various sizes and a few are marginally below the £5.69 quoted, e.g. 'Bucket' in XL is £5.53. Images and links are below.
Bucket in S - XL (XL is £5.53)
Goliath in S - XL (S is £5.68)
Griffin in S - XL (XL is £5.53)
Val in S - XL
"High quality 100% pre-shrunk cotton for a long lasting fit after multiple washes. All artworks are original licensed designs and printed using a highly durable silk screen procedure."