This is merely an opinion, but the standard (read: best version of the mod) would likely involve 62/55g springs, victoriniox multitool oil, krytox 103/205 mixture, even on a pcb mounted board. That alone would cost about:
1. springs - 8usd
2. multitool oil - approx 5 usd
3. krytox mixtures (provided you got in the GH GB) - 10 for 103, 20 for 205 - 30 usd.
That's 43 bucks not counting labor (approximately 1-3 hours, depending how fast and through you are). If you include desoldering and soldering, that's likely another 30-40 bucks in terms of labor, and that's not counting shipping if you're getting someone else to do it for you. Not to mention it voids the warranty.
There's also many subtle variations to each person's ergo clear mods, which is why I seldom put it up as a recommendation, since there's no production boards with these on to have a certain level of consistency. Considering the cost, unless you are able to get a good deal on a modded keyboard with ergo clears, you might actually want to give topre a try instead.