Just checked the website of a random Japanese supermarket, no clue if this is a normal price, but chicken breast (domestic) was available for ¥78/100g ($3.27/lb), 60% ground beef + 40% ground pork (imported) was ¥148/100g ($6.17/lb), and 100% ground beef (domestic) was ¥258/100g ($10.80/lb)
So...