I don't know much about shamray guitars but here is what I do know about 8 strings........
These are new instruments, they have not been around in the electric world long.
Parts are not cheap for an 8 string nor is the labor. When you start adding in things like 30" scales the cost goes up even more.
The Leviathan 8 string guitars I build are more expensive than the 6 and 7 because of parts cost and the work involved. The body cost is the same, however, the necks are not. The blank material for fretboards (particularily ebony) doubles easily, 2 truss rods aren't really the best way to go, carbon reinforcement with a single rod is very strong however, but add's to the cost. Pickup availability is low, and they are expensive, I have access to some well known pickups from companies that will make me custom 8 string pickups, however, you pay dearly for those.
Then you have extra tuners to contend with, string ferrules etc.
Next, the extra time involved when you want a 30" scale. The Leviathan 8 is a 27" scale which is longer than average already, a 30" scale would be fully custom. It also creates bigger balance problems.
Wanting a 3 piece neck add's to the cost also.
Basically, what I'm saying is, $1000 is not going to get you an 8 string guitar unfortunately. I have no clue what shamray guitars would charge, but I do know shipping and duties from Russia will jack your price up significantly. Looking at their pricing it's low, really low, but that concerns me too, typically the lowest price is not the good choice. However, maybe that's typical in Russia, I don't know.
A very basic 8 string will run you probably about $1700 to $1800. The Leviathan 8 is $2050 base.
When you compare to the only other company producing any number of 8 strings (Conklin) you will probably find those prices to be less than half of Conklin.
Not to be discouraging, I'm only trying to show you what to expect so you're not let down.