I'm just kind of getting serious about value investing over the past few months and I'm curious what websites people use to screen for investment ideas. I've mainly just been using Google for it's pure simplicity, but it doesn't allow me to create the custom screens that I am looking for.

Primarily I would like to be able to create some of the Graham type screens, like NCAV <= 66%, or other similar screens where you need to do a simple calculation between a few fundamentals.

How do you do this? Obviously, I am looking for a free service and I am aware that oldschoolvalue.com posts a list of NCAV, but I prefer to be able to do things myself rather than rely upon a list posted by someone else. If I can't replicate results I tend to be skeptical of methods in most endeavors.

Second question concerns gurufocus - what are people's general thoughts concerning the value of gurufocus.com? Does anyone pay for the service and if so why and what do you like the most and do you think you are getting good value?

Finviz is the best free screener that I'm aware of.

How would you use finviz to screen for NCAV <= 66%? I've looked at finviz but haven't been able to figure out how I could do that, and I admit, I might just be dumb.

http://www.grahaminvestor.com/screen...r-ncav-screen/

Found this screen.

Not sure if you can do that type of screen. I more meant it's the best screener in general that I've found. You could do a screen for very low P/B stocks and work through them to find the net-nets.

This one has a wider scope.
http://markets.ft.com/screener/customScreen.asp

The best screener I've seen is www.screener.co

It's free trial for 30 days and then $20/month after that. Hands down the best I've used that is publicly available and free-ish

here ya go, all companies under NCAV with market caps over $500,000 and with an annual report filed in the last 15 months. source: screener.co in under 5 minutes.

Symbol % of NCAV
CHSCP 52.7%
GEOS 93.6%
WMAR 93.7%
SHOS 68.1%
TWMC 82.0%
MN 93.9%
FSYS 61.8%
GENC 81.5%
RELL 60.6%
VTL 82.0%
HERB 17.5%
AXTI 86.9%
SPRT 85.8%
LF 37.3%
GLPW 73.1%
FRD 87.2%
MSN 60.5%
RBCN 41.8%
ERS 67.7%
BVSN 82.5%
CLDN 40.7%
QCCO 59.5%
ANAD 92.4%
CYCC 93.5%
RESX 99.9%
HDYN 51.7%
UNXL 96.6%
NSPH 79.8%
KBIO 63.9%
STRI 39.9%
APPY 62.5%
PARF 67.8%
NSYS 93.2%
GID 22.5%
MCVT 94.7%
WGA 98.4%
SODI 87.3%
DCTH 61.9%
DPDW 77.2%
LGL 94.5%
WGBS 81.0%
OPTT 56.6%
MPET 40.3%
SINO 97.8%
TIGR 98.4%
SPRS 77.1%
LPTN 49.4%
VIDE 53.3%
PRSN 96.9%
JLMC 69.5%
TAIT 54.5%
TCCO 68.9%
CCOM 98.0%
SMGI 73.2%
BDR 64.9%
AMCO 14.6%
ELST 74.6%
ERMS 87.7%
HICKA 86.3%
IAIC 99.6%
AMIN 29.7%
LVWD 39.9%
INPH 35.7%
AXLE 76.6%
RBCL 95.3%
PWEB 72.4%
ALOD 77.8%
MFCO 77.0%
OPXS 16.5%
TMED 33.2%
ALTX 37.1%
PCYN 53.7%
INKS 68.3%
GEEK 24.2%
GTPH 58.6%

I've used Zacks a lot and grahaminvestor.com. You can tweak a ton with Zacks free

http://www.zacks.com/screening/stock-screener