Flying saucers are not good wheels
Upright wheels are the most appropriate and actually allow for a natural running pattern,whereas flying saucers do not and will cause side arching.Just something to keep in mind
If you could get a bulk discount on Silent Runners it would be wonderful,and you'd likely be the only person to ever carry them in store so you'd have a unique choice too!They're superior to any other wheel on the market,being the safest wheel and being extremely durable along with all the other benefits.Try and encourage the splurge on a good wheel but maybe give ideas for saving on other supplies,like DIY toys and such which are cheaper while if you go cheap on a wheel it really doesn't do much good if any
Maybe also mention that there's no guarantee a young hamster will stay small so they'd end up spending twice as much trying to get a bigger wheel once the hamster outgrows the smaller wheel,as that can be extremely helpful,or make sure the customer is aware that certain more expensive wheels(the Silent Spinner definitely not being one that is worth the money)can be extremely good quality,last longer,and are more quiet if not silent in some cases(very rare,the Silent Runner being the only one that stays silent).