Think it's cheap? I don't think so

Yeah, it is more expensive then it seems. The following is a list of what I've bought/going to buy:

Stuff I've bought:

Plastic cardboard: $6.00 for 2 sheets
Utility knife (penknife): $2.50
50cm metal ruler: $5.00
Masking tape: $2.00
Duct tape: $2.00
Craft knife: $3.00
10mm dia. acrylic tube: $4.35
6mm dia. acrylic rod: $3.42
500 sheets A4 paper: $5.00
Hot glue gun w/ 5 glue sticks: $7.50
Super glue: $1.00

Sub-total: $41.77

Stuff I'm going to buy:
Nerf Maverick: $21.90
Airsoft BBs (1000): $12.00
Mini drill: $16.90
Air dry clay: $20.00 est.
Rifle scope: $19.50
Rifle scope mount: $10.00
Scope rails: $10.00
Spray paint: $10.00
15mm dia. PVC pipe: less than $10
Steel/copper wire for spring: $????
20mm and 10/8mm acrylic tube: $????
Sub-total: $120.30

GRAND TOTAL: $162.07 (add $30 more for misc. items).

I never expect I have to spend so much. It would certainly be a lot cheaper if it's just a model that can't shoot.