Thinking of changing things up- businesswise

I am debating closing my current dot com store (www.scarboroughseashells.com) and utilizing a shopping cart feature here on my blog in addition to my Etsy shop to sell from. The company I currently use is Prostores, and while I don't have any real problems with Prostores, I just can't justify the monthly cost when there are so many other options out there for less money.

I own my domain name for another year and could easily direct it here to my blog (before I opened my current website, I used to direct it to an eBay store). I am thinking that I'll use a PayPal shopping cart or something similar- does anyone out there in blog land have any experience with this?

My main question is- if I just create and "add to cart" button each time I put up a blog post with a new item, what do I do once the item sells? Am I going to have to go back into all my old posts and remove buttons so one-of-a-kind items don't get double purchased?

Also- is there a simple way to create a unique page in my blog just for shopping? I know I can add a specific tag to each post and then make a link that goes to those posts (like the current "recipes" link at the top of my blog now)- but am I missing something, is there another way to do this?

Finally- my other big issue is my email addresses- I currently have two that I use, but they are generated through Prostores. I can create email addresses using the company I bought my domain name through (GoDaddy) but I don't know if I can create them while the current ones are still active and I'm afraid if I shut them down at Prostores, there will be a lag time before the GoDaddy ones get activated and I'll lose some correspondence into the cyberspace abyss! Aaack, the dilemnas!

Any and all advice appreciated!

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