Crib mattress...

Lacey • Mommy to an Angel 1.14.16; wife 9.24.16; rainbow baby 4.4.17 && Baby #3 Due 4.28.20
So I have a mattress from a company called Purflo. And they sell crib sheets for this mattress on their website but they only ship in the UK... I'm in Canada. 
Anyone know where I can find a crib sheet that will work with this mattress?