Ink Cartridge History, Progression?
Take a look at how the cartridges and prices have changed in the past 3 years . . .
3 years ago the HP 45 was one of the most popular cartridges on the market, today it's the HP 21- compare page counts to price!
Cartridge Page Yields Retail Price* Price Per Page Cartridge World Price Price Per Page Savings Per Year**
               
HP 45 833 $29.99 0.036 $17.95 0.022 39% $36.12
HP 78 970 $55.99 0.058 $26.95 0.028 50% $87.12
     
HP 56 450 $19.99 0.044 $13.95 0.031 30% $30.20
HP 57 400 $34.99 0.087 $19.95 0.05 43% $75.20
     
HP 02 BL 200 $17.99 0.09 $9.95 0.05 45% $96.48
HP 02 CLS 200 $9.99 X 3 = $29.97 0.15 $6.95 X 3 = $20.85 0.1 33% $109.44
     
HP 94 450 $19.99 0.044 $12.95 0.029 34% $42.24
HP 95 260 $21.24 0.082 $15.95 0.061 26% $31.74
     
HP 27 220 $17.99 0.082 $10.95 0.05 39% $77.44
HP 28 190 $22.49 0.118 $15.95 0.084 29% $71.94
     
HP 21 150 $15.99 0.11 $8.95 0.06 46% $112.64
HP 22 140 $17.99 0.13 $10.95 0.08 38% $112.64
Notice the trends from the manufacturer - cartridges hold less - 81-86% less ink    
The good news? As the cartridges get smaller - refilling saves you more!  
Environmentally? Instead of using 3 cartridges each year, now you use about 16!  
Each cartridge takes oil to produce, typically produced overseas, hundreds of years to decompose!  
*Office Depot Published Price and Page Yields for Cartridges in current catalog
** Savings per year is based on an average of 200-220 pages printed per month and the number of cartridges
needed throughout a year based on page yields/retail price/Cartridge World Price.