555 PRICES
The purpose of the 555 article is to alert you to the advantages and disadvantages of the 555 and its derivatives. 
In many cases, a 555 circuit can be replaced by a building block using a gate from a Hex Schmitt Trigger, such as the 74c14. This chip is equal to six 555's and costs about us40¢.

The following table identifies some of the 555 and 7555 markings and associated manufacturers.
Take care to determine if the IC is a standard TTL version or a CMOS device. 

Manufacturer

Type Number
Exar
Fairchild
Harris
Harris
Intersil
Lithic Systems
Maxim
Motorola
National
NTE Sylvania
Philips
Raytheon
RCA
Texas Instruments		 XR-L555
NE555
HA555
ICM7555IPA
SE555/NE555
LC555
ICM7555
MC1455/MC1555
LM1455/LM555C
NTE955M
ICM7555C
RM555/RC555
CA555/CA555C
SN52555/SN72555

The following table gives approximate prices for 555 and 7555 IC's:

NE555
NE556
NE555D (surface mount)
TLC555 (CMOS)
TS555CN (CMOS)
LM555CN (not CMOS)
TS3V555ID (3v timer)
7555
ICM7555
ICM7556		 us36¢  Au$1  50p
      Au$1.75  50p
us28¢
$1.49 Radio Shack
us40¢
us35¢
us40¢
         Au$3.15
us60¢
us$1.10