I second what @RichJB said - only using Sir Vape's line is going to limit you to such an extent that you're never really going to be able to DIY properly.
If you think about it - all Sir Vape has done is order the stuff online, increased the price, and put it on their shelves for you to buy. If they can order it online (and every other DIYer) then why not you too?
If you think about it - all Sir Vape has done is order the stuff online, increased the price, and put it on their shelves for you to buy. If they can order it online (and every other DIYer) then why not you too?