Hummer Limo for my birthday?

So I had this crazy idea about me having a hummer limo at my birthday. It sounds like it would be really fun, but my birthday is like in August so I have a lot more time until then. I have already asked my mom, and she thinks it's a pretty good idea, hahaha but I kinda need to know how much it would cost to rent a hummer limo for about 4-7 hours?