We use Magento for our cycle clothing or you could use something like Big Cartel
http://www.morvelo.com/
Big Cartel etc. are very basic primarily used for people selling odd bits & bobs online. Magento is a professional customisable e-commerce platform, when we started our brand we looked at these options too but preferred the professional look that a Magento store gives and the scope for expansion and control. There will always be a cheaper option but just check that it gives you the options for the future when this takes off and that it conveys the correct message for your brand.
Also the Magento store would be run from your own hosting account, the others Big Cartel & Shopify are run from their respective servers.
Check any additional transaction charges on the other stores offer and how much it costs you extra a month to customise their existing templates.
Also all you are getting with those options are a shop you will still need to create your website to plug the shop into
This may be of use to you, obvious advantage of Magento the SEO results and control
Big Cartel:
advantages
Use your own domain
Users don't need to sign up to check out
disadvantages:
doesn't offer e-commerce analytics
not a lot of flexibility with discount code options
poor SEO control of meta tags
Magento
advantages
Use your own domain
Great for SEO
up sell, cross sell, and can do just about any discount offer you can think of
unlimited products
use any payment gateway you want
e-commerce analytics
disadvantages:
more expensive, because development takes longer
