LM reps (Miro 279) Please help!

[BMXWill]

So my day was ruined when I noticed a crack in one of my rear rims 18x9 Miro 279. I bought them used so I'm wondering if anyone on here knows a dealer around the GTA or what the best way is (if possible) to purchase a single replacement rim. I am going to call Modbargains on monday but they only list them as a set of four on their site.

Thanks in advance.