Actually portable CD players get very cheap due to the availability of MP3 players. Some current price examples in EUR are: 19,90 EUR for a simple one without MP3 capabilities and 59 EUR for a model with MP3 functionality.
Some DVD players that are good for children are manufactured by the toy company Fisher-Price. However, these ones are a bit out of your price range, at $200. The Disney line of DVD players are available for around $100.
I have found there are several models of portable printers. They range in price from $200 dollars all the way up to $500 dollars. These portable printers are great to have since you can take them with you no matter where you go.
A really good portable DVD player would cost between $100-200. Cheaper ones that are sold at walmart, CVS or Toys R Us can range from about $30-70.
"Portable ultrasounds can range in a wide variety of price depending on the type of ultrasound system one would be needing and wanting to buy. An ultrasound system which you can use to look for blood clots or check on fetus for example, start at $10,000 and increases in price."
Yes, there are still many companies that make portable CD players. Memorex, Sony, Coby, and GPX all make portable CD players that can be found at stores such as RadioShack, Walmart, or Target.
A light weight portable cassette player is what you would want.
Used portable bleachers are normally inexpensive. They can range from $50 to $1000
The Bose L1 portable loudspeaker can be found directly on the BOSE website. The price listed there is $999.95. The average price of this unit would therefore be expected around $1000.
In the battery.
A portable CD player would be as reliable as a MP3 player but it is harder to carry around because you have to carry the CD's too. A MP3 player would be much more convienent.
Why would you?
That would be a Portable Video Player. I'm pretty sure the Sony PSP can, and there are probably some smart phones that can do it too.