Wordpress eCommerce web developer needed

Hi I need web developer who can help me out when I need website changes. I need someone who is:

1. good in wordpress, knows about checkouts for selling with paypal and digital file delivery to customer.
2. responds to messages fast
3. is available to do updates within 1-2 days

I need to update existing website layout at the moment and update checkout process with paypal. Later I might have extra work with bigger budget.

Thanks