modx ecommerce addon or stay with wordpress woocommerce

Hi,
i'm a new modx user, and i love it as it allow me lot of more creative freedom (im front end designer) before modx, i always used wordpress
today i have an ecommerce to build, normally i use woocommerce with wordpress
but i'd really like to make my layout with modx, is there and ecommerce addon, easy to install, secure, that can implement credit card payments, and free
I'm searching trough the forum, i see foxycart but it seems very expensive (well i don't really understand how work they pricing, and finally is it more expensive than paypal comisiions, or bank commissions, i handle the design, not the shop management)
and i also need something with tutorials, and no needs of php development (well i can pay somebody to implement the credit card payment, as i do with woocommerce)
Thanks!