Boards are $3~ from OSHPark [I don't have it shared yet (I haven't tested the prototype yet)], the 20K 0805
resistor is like $.50-$1.00 for 10, and the
AOD510 MOSFET is .81 a piece
Board: 2 layer board of 0.79x0.79 inches (20.12x20.12 mm). Your design will cost $3.10 per set of three.
So what $3.10 + $1.00~ + $2.40~ (shipping USPS first class is like $3~) so about $10 for 3, so about $3 a piece
Then you just build them (SMD can be built with solder paste, and either a hot air gun or even dropping the board on a stainless steel frying pan and heating on the stovetop, or even with a soldering iron), solder the leads from the switch to SW1 and SW2, the + wire from the center via to the center pin on the 510 connector, then GND to the outside of the 510 connector
Push the button, the button pulls very small current between the + trace thru R1 activating U1's gate and full current flows from source to drain thru the coil in the vaping head screwed into the 510 connector, and voila...your mechanical possible crappy push button bolt now becomes a solid state "Lightening Bolt"
like I said though, untested...so I don't even know if they will fit, the schematic of the MOSFET was simple enough, but making sure it fits in the bolt around that big ole switch (which you could use a very small momentary switch now)