what kind of online store are we talking here? please specify..
Do you have a website?
An online store could be any kind. Just google and you may get more clarifications.
@OP
If you are offering services for scripts then $50 for online shop scripts is very cheaper or you are just talking about online version for a physical shop for purpose of showing what we have in physical shop?. Please be specific on what your service is about.
I guess we can get a online shop script for $50 but it would be very basic one and may be suitable for any preliminary business start ups with less very less shopping cart options. Moreover, these type of basic scripts are available for free of cost also. Lets wait for OP to clarify about his services.