They're pretty easy to find on eBay and the price is not too bad look up chupsawelt on eBay. I'd personally have gone for heavier thread or heat seals for the seams but thats just me being an engineer, do be careful around the butt seam though, it has a reputation for tearing when put under a lot of stress. This is why I tend to keep to low stress positions and low stress activity.
I look forward to getting vacuum sealed in the suit but that will need to wait for Wednesday at least since I used this weekends vacbag ticket already xD