how much $ to fix ticky lifter?

[dumpstafresh]

i already asked this question once but i think i worded the title wrong.

i have what im pretty sure is a noisy lifter. because...

it ticks louder when hot(especially after ive been racing it).
thicker oil seems to quiet it up a little.
i used a long a$$ screwdriver to try to find it. and it was lodest on the middle of the drivers side valve cover.

anyways does anybody know how long it takes or how long it calls for to change a lifter. or how much a lifter costs.

i also kinda heard the tick when i put the screwdriver on the intake manifold, just to the drivers side of the black plastic cover, just front of the center.
is there any thing that would tick under there.

i did search and couldnt find anything. if there is a thread about the $ part of this issue just give me a link and ill be happy.
THANKS