Dear Members of the Public, trade counters are NOT showrooms!
Do your research about what you want *before* rocking up at the counter.
Preferably, from home. Then present yourself at the counter for click-and-collect, take your stuffs and leave.
But if you must, there's a laminated catalog on a desk in the corner. Stand quietly in the corner, make your selections, write the part numbers on the slip provided, then present yourself at the counter.
Pls not to be rocking up with only the vaguest idea of what you think you might want, then spending 30 mins asking for advice, wanting to see each and every thing.
If that's what you need, pls to be going to a showroom staffed with people who's job it is to offer advice and demo the stuffs.