I'm going to suggest a source for smoother and mixing paddles Bon Tool-
http://www.bontool.com they ship UPS or may have a dealer nearby, reasonably priced.
Tools are listed as epoxy equipment
Mixer (egg beater type) part no.....12-851-B7.... This may be cheaper at a big box.
Smoothing paddle 18"...14-916
Adjustable spreader 24"...12-689-B10 (small jobs not critical)
Smoother and spreader come with 5' broom handle.
Custom Levelquik ES Home depot will get this for you. You must tell them it is a SPECIAL ORDER MODEL # LQESL50.
[Edit, CX, 02-22-17,
from Custom through alert reader lojoma] "This particular product will be a special order for Home Depot. The special order SKU # is 307254. The item number you provided is correct (LQESL50). Your local Home Depot will need to call our customer support for pricing."