seems pretty open to me
Maybe they would appreciate a variety instead of just one or two teas. Plus if one doesn't brew well with their setup hopefully another will.
I would stick with a good variety of unique tastes and buy teas that aren't too pricey/oz. The taiwanese oolong sampler at floating leaves tea is pretty varied in that regard. Then you can throw in a keemun, a green tgy, silver needle, and an oz of four seasons something like that...
That won't go over 50. Or you could do a variety of samples from jing tea shop (I would rather do this personally, but takes longer). The everyday dancong, dragonwell, and red tea sampler may please them. Also the seasonal dhp. That would be about $50 after shipping and plenty of tea! Or simply just a variety of different oolongs in 25g samples would be nice. Also teaspring seems very good for variety of 25g samples and shipping is cheap. Just have to wait for slow mail.
Sounds like your friend will enjoy any of these options.