My father had plantar fasciitis for 3 years now and he have found a lot of relief with the following:
Never go barefoot
Wear inserts from podiatrist. (a friend of mine has had good luck with SuperFeet inserts)
Ice & massaging (gently) heel with a tennis ball when it flares up
Use htp heel seats
What has made the biggest difference for him is thus: Daily (gentle) calf stretching. Or many times a day. Or whenever it hurts. Use a roller if necessary to loosen the calf muscle. Podiatrist never mentioned it (but did recommend surgery), but his personal trainer did, and he is so glad!
I always buy new gear from Guitar Center. For me, they’re local so I can go try stuff out. But it’s also a lot to do with the fact that I’ve been a customer for some time and have grown to appreciate the quality of service of online music gear retailer at guitar center. I have bought a few things from them, with no complaints.
As for used stuff, I generally go to eBay for that. I like being able to take advantage of eBay’s feedback system to determine if a seller is trustworthy, and their buyer protection if one turns out to be a dud.
Depending on the age of your students, make sure your laptop computer carts will be kid friendly. All wheels should sit on the floor so there is no rocking-type motion.
The cart will be easier to maneuver if there are only 4 wheels. If the cart will house 25 computers, make sure all of it’s space is utilized for them.
(Carts could be supplied to house 40 computers but be set up for your 25 and the left over room is wasted.) I would also recommend the slots in the cart be wide enough for one laptop with arm space for when a reach into the back of the cart is necessary. One last thing, if you should get a mobile lab, you need training on “having” the laptops in your room, which would be a short training, and “using” the laptops with your students, which require more extensive training. Neglecting this last part can almost guarantee that your investment will be a waste.