discounts and product quantity display

Hello!

The website i've been developing requires the ability to purchase registration for a series of dog-training classes. I've tried event management plugins, but they don't allow me to do one thing that is important to them (discounts based on selection of a checkbox - eg: click here if you are a club member - which gets them a % discount. coupon codes are not something they desire). I've found that you are able to do something similar, which is the same idea as ordering an XL tshirt, only instead of a surcharge the selection gets them a % discount. Can someone confirm this is in fact possible and very easy to do?

Now this brings me to the next feature - as I NEED this or I'll have to continue searching for another plugin...

Product quantity ( available spaces) - in this case, I need a way to display the available spaces in the link that leads to the form.

For example -

SIGN UP FOR CORE CLASS A (10 SPACES LEFT) <--- (which is a link to the form, spaces refreshes automatically)

If someone could let me know that would be much appreciated and i'll get the dev license right away.

Thanks!!

-Ty

great, thanks David!!

What i'm after is being able to have a link that leads to the specific form, on a regular page. Would I essentially be able to add the "only %s left - click here" to a page? Or would the entries left have to be on the actual form page?

Also, would there be a way to keep the form up even after the entries are sold out, just disable them from purchasing?

Sorry for so many questions, the client is very specific...