This is about the CHEAPEST, most PRACTICAL kit I have been able to come up with so far.
If you only have money for one, buy the first one listed. These are listed in order of usefullness.

Brazilian Portuguese-English Dictionary & Phrasebook : English-Brazilian Portuguese
(Hippocrene Dictionary & Phrasebooks) by Osmar De Almedia-Santos ~ USD 10.00

Larousse Concise Dictionary : Portuguese-English/English-Portuguese
(Larousse Concise Dictionary) ~ USD 12.00

The Rough Guide Dictionary Phrasebook Portuguese: A Rough Guide Dictionary Phrasebook (Rough Guide Phrasebooks) ~ USD 5.00

" Contra o Brasil " by Diogo Mainardi **

** This book is not a language course, but a parody by a controversial journalist. It is listed here as an idea for something to use your dictionary on.