My printer is showing horizontal lines whenever blue ink is USED. (Not streaks)

Changing cartridges makes no difference, nor cleaning or aligning.

Does this mean a new printer?You have done the recommended method of replacement of the ink, -right?
There is not really  a whole lot you can do. Did you try the old ink cart to see if that makes a difference? Clean out any wasted ink.

Otherwise, yes you may have to buy a new printer.
The model you have is a very low cost  entry level printer. But is excellent for  home or small office use. Generally has good REVIEWS and is remarkable in its prince range.
Replace it with the same model for well under $70 at some outlets.
If you do buy another, pay attention to the warranty terms. Some require you to return the item to the manufacturer, not the store.

For some reason, the price on this printer depends on the local store.  So you will have to contact the local outlet directly and see what the sale price is.
BTW: Some places still ASK over $110 for this model. Who KNOWS why.Did you try cleaning and aligning only once, or more than one time?  If only once, try it again, maybe two more times.  After each run, compare the results with the prior runs.  Any change?

This might HELP: http://usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_mp_series/pixma_mp280?CMD=MIXED_SEARCH&mName=PIXMA+MP280&mType=PIXMA+MP&pageKeyCode=ekbresults&searchString=prints+lines+across+page&BASIC_SEARCH_CURRENT_TOPIC_ID=1061&BASIC_SEARCH_CURRENT_TOPIC_TYPE=0&RESULTS=RELEVANCE&RELEVANCE_START=1&RELEVANCE_COUNT=25&CONFIGURATION=1011&PARTITION_ID=1&TIMEZONE_OFFSET=null&USERTYPE=1&isSecure=false

Is it still under manufacturer warranty?