I wrote to SMA about this very subject a couple of days ago as we didn't want to take enough tins of milk powder to cover a 3 week holiday. Here is their helpful reply :

"In America the only products available are equivalents to SMA Gold, SMA
Progress and SMA Wysoy. These are sold to supermarket chains to use as
own brand products, for example in the Wal-Mart chain these products are
sold under the name Parents Choice (available as powder or liquid
formats). They are also available in other stores under different own
brand names. There is a helpline for Wyeth Nutritionals in the USA who
can be contacted and they will be able to advise you on any stores that
sell these equivalent products and the brand name under which it is sold
in any given area.

SMA White and our specialist feeds (i.e. SMA High Energy and SMA LF) are
not available in the USA.

Local equivalents of SMA products are:
SMA Gold - Enfalac made by Mead Johnson (Tel: 0208 572 7422) SMA White -
Similac made by ROSS Laboratories UK (Tel: 0800 252 882) SMA Progress -
Carnation Follow-On BUT this is not readily available, as American
thinking is that there is no harm in giving an iron-fortified formula
from birth. SMA Wysoy - Prosobee made by Mead Johnson (Tel: 0208 572
7422)

FOR YOUR INFORMATION - Please be aware that American products are also
available in liquid concentrate format that will still need to be
diluted.

WYETH NUTRITIONALS HELPLINE - 1800 272 5095 (9am-5pm Eastern Standard
Time). This number can be called from the UK but will be charged at
International Dialling Rate.

It is important to check the preparation instructions for each product
in the country that you are visiting. This is because scoop sizes can
vary and the amount of water required for each scoop of powder will
change accordingly.

There may also be a slight variation in the levels of some of the
nutrients and/ or some of the ingredients used. Therefore, for the
duration of your stay abroad, you would be best advised to take enough
supplies of your baby's usual milk with you. It is also advisable to
contact the airline you are flying with beforehand as they may offer you
extra luggage allowance for the milk and could give you advice on taking
milk into the country you are visiting. They are usually quite helpful
on board the aircraft with the preparation of feeds.

You may need to consider using a bottled water for making up feeds
whilst you are away. Should this be the case you need to select one
with a sodium content below 20mg/litre of water. The water needs to be
of the still variety and should be boiled before use."

Hope this is of use,

Sue