Vistaprint vs redbubble vs Printing costs

I decided to check out Vistaprint for their tote bags and stickers and compare them to redbubble. While I could use vistaprint, the design is bigger and cheaper through redbubble, as well as having cutout custom stickers. When over 10 are bought they come to 90 cents each, which makes the cost reasonably affordable. While I havent bought a tot from redbubble, I know that their sticker quality is really high and the smallest size is still very decent. The shipping cost is also cheaper and would take around 10 days to ship, making it very convenient for my project. Vistaprint also offered stickers but didnt allow for custom cutouts, which means the designs would be limited to circles, rectangles or rounded rectangles.

 I wouldn't mind printing multiple on sticker sheets and hand cutting them, as once I have finalized the designs all that needs to be done is printing and getting ready to setup for the exhibition, so I would have a lot of time on my hands and it would be cost effective.

1 A4 sheet can approximately fit 10 stickers.
$18.99 ÷ 20 sheets = $0.95 per sheet

0.95÷10= $0.095
Each sticker will cost around 10 cents to make in terms of paper costs. I'll have to find out if I could use the SIT printers for the stickers as I will need an inkjet/laser printer.