Online Shopping Carts Available...
E-commerce Solutions and Options:

Shopping cart sites versus complete websites with shopping carts:

• I prefer websites that give you the most options and are better with SEO. I always opt for a website with pages and content writing, plus an option to connect a blog with social media linking, and thirdly, with an online shopping cart. These combined tools can really help with optimization efforts.
  

Considerations:

• Make a specific list of features you "must have" for your shopping cart, and then your added desires as you compare features, pricing and available options.

1. Is integration with Amazon or Ebay important / mandatory for you?
2. Wanna start smaller but future expansion important?
3. For SEO marketability, are options to input descriptions and tags on shopping cart pages important to you?
4. Keeping your initial investment or monthly/yearly expense at a minimum a priority?
   

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Current Pricing
(Some comparisons - This can change)

Weebly Pro Plan:
25 Products at approximately $84 per year.
(* SSL Certificate NOT included)

• Weebly Business Plan (I like this plan)
  

Unlimited Products $250 - $299 per year, depending on advance payment plans, then it's cheaper. (SSL Included)


Shopify: One of the kings of shopping carts - lowest price starts at $14 a month/ but with very minimal features... but a variety of packages and options are available... up to their best package at $228 a month = $2,736 per year.

Volusion:
SSL Certificate -additional fee.
(Monthly Fees)
15 - 100 products ($180 year)
35 - 1000 products ($420 year)
75 - 10,000 products ($900 year)
135 - Unlimited Products ($1,620 year)

Web.com:
34.95 / 59.95 / 99.95 range of Price/Package monthly plans.

Many more options are available to you.
Depending on how advanced and intricate your needs are, it may be worth it to take time and compare... Wix.com, PinnacleCart, Squarespace, BigCommerce, Etsy, Network Solutions, GoDaddy, Jimdo, etc...

Good Resources:
http://www.sitepoint.com/ecommerce-seven-carts-reviewed/
http://Top10OnlineStoreBuilders.com
http://www.top10ecommercesitebuilders.com/Reviews

Comparing Price and Choices

For unlimited products, I like the price of the Weebly shopping cart options in the Business Plan. The checkout process is easy and it doesn't force customers to "create an account".

Its a very functional cart with a number of choices available at a much lower price than say ... a Shopify online cart or Volusion.

Keep in mind it does not have as many features  (but... if you don't need them) it offers so much at their lower competitive price.

Weebly accepts PayPal and also accepts onsite credit card payments through Stripe. Weebly provides fraud protection and Secure Socket Layer (SSL) encryption additionally, already paid for in their business plan. This is for the protection of you and your customers. SSL technology makes it possible to send online payments securely and all websites with shopping carts should invest in SSL protection.
Weebly is a very reliable, rock solid cloud based server and hosts over 30 million websites worldwide. I like weebly, can you tell? :-)

Online shopping carts available, secure site shopping with SSL certificate, Paypal, CSV file downloadable, can integrate with Quickbooks, etc.