At home I use a gaiwan - its pretty easy to get the hang of and I got mine in Chinatown for $5. As mentioned above, its glazed, so can be used for different teas without any problems.
Yixings are unglazed and can take on the flavour of the teas brewed in them over time - so best to keep one for each type (as in cooked vs. raw pu'erh, oolong, etc...) of tea you use.
As mentioned above, the inexpensive yixings can be less than ideal, with problems ranging from outright fakery to poorly fitting lids, etc.
At work, I use a very cheap lidded mug with a removable strainer (not a tea ball). The strainer is quite large relative to the size of the mug and allows for very good water circulation. While purists may cringe, it works quite well and I've not noticed any impact on the flavour from the fine metal mesh strainer.
Yixings are unglazed and can take on the flavour of the teas brewed in them over time - so best to keep one for each type (as in cooked vs. raw pu'erh, oolong, etc...) of tea you use.
As mentioned above, the inexpensive yixings can be less than ideal, with problems ranging from outright fakery to poorly fitting lids, etc.
At work, I use a very cheap lidded mug with a removable strainer (not a tea ball). The strainer is quite large relative to the size of the mug and allows for very good water circulation. While purists may cringe, it works quite well and I've not noticed any impact on the flavour from the fine metal mesh strainer.