have you ever noticed the Sale or the sell?

I have noticed this on Craigslist, Ebay, and Fabo, so it can't be a typo. I am just wondering...

Why is it if you have a car and you live south of the boarder your advertisment may start like this...

I have a car I have to sale...

but north of the boarder it would sound like this...

I have a car I have to sell...

I just don't understand the sale part. It sounds like bad english to me...and trust me I have bad english already!

Phil